VOL. LXV.] 



PHILOSOPHICAL THANSACTIONS. 



6l5 



8, At Albany Fort, in Hudson's Bay, Sept. 14, 1774, long. 82° 30' w., lat. 

 32° 22' N., variation 17° w. Dip 80° 2'. 



Observations on Hoy 1/74. 



Month. Hour. Barometer. Thermometer. Weather. Circumstances. 



June 11, 1774. 15 2S.6,3 59 Cleai. On the top of the hill. 



30 28.6'0 56" J Foggy. Ditto. 



4 15 30.22 63 Clear. At low water mark. 



Hoy is a remarkable high hill near Stromness, in tlie Orkneys, and is placed by Mr. Mackenzie 

 in lat. 58° 58' n, and long. 3° 30' w. from Ixmdon. The first 2 observations were made on the 

 highest part of the hill. Soon after the first, a fog was seen below arising from the water, at length 

 it reached the summit of the hill ; the air seemed very raw and cold to the touch, and the instruments 

 showed as in the 2d observation. The barometer continued at 28.60 inches after the fog was gone off, 

 but the thermometer rose 2 or 3 degrees. The last observation was made at low water mark, about 

 half a mile from the bottom of the hill. Thomas Hutchins. 



" The height of Hoy above low water mark according to these observations should be 249.93 

 fathoms, or as near as may be 500 yards, neglecting the correction for tlie difference that may be 

 fupposed in the temperature of the quicksilver at the two stations, the quantity of which is uncertan.'' 



S. HORSLEY. 



XV. A Meteorological Journal for the Year IJT'i, kept at the Royal Society'' s 

 House by Order of the President and Council, p. 139. 



The observations of the barometer and thermometers were made two times on 

 every day of the year, viz. at 8 o'clock in the morning, and about 2 afternoon. 

 And the numbers collected for the several months were as in the following table. 



Means of all 50.6 52.4 29.88. . 26.312 



, The quantity of rain in the whole year was 26.312, or about 26^- inches. 



For the Variation of the Magnetic Needle. — These observations were 4 times 

 every day, from August 21 to Sept. 5, viz. in the morning, at noon, at 2 after- 

 noon, and in the evening; the means of all which are respectively as below. 

 Morn. 21" 25' noon 21° 33'. ... 2 p. m. 21° 28'. . . . even. 21° 17' 



